Forging process of large forged ring

An embodiment of the invention discloses a forging process of a large forged ring, which is used for forging the large forged ring. The forging process includes the following steps: forging a long-striped blank with a rectangular cross section in a flat cast ingot mode, cutting a long-striped groove hole in the middle of the long-striped blank with the long side of the long-striped groove hole being parallel to that of the long-striped blank; widening the long-striped blank with the long-striped groove hole, expanding the groove hole, and obtaining a polygonal ring blank; and forging the polygonal ring blank into a round forged ring in the radial direction. The forging process of the large forged ring adopts the flat cast ingot mode to produce a large forged ring, is capable of effectively resolving the problem that a round cast ingot is difficult in forming and low in forging efficiency and effectively improving production efficiency, and meets requirements of users.